Alert archive / New Jersey / Tornado Warnings in 2021

Tornado Warning 32, NWS Philadelphia/Mount Holly

August 19, 2021Hunterdon County, New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this tornado warning at Aug 19, 2021, 12:48 AM EDT for Hunterdon County, New Jersey; Bucks County, Pennsylvania. It was in force for 27 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 19, 2021, 12:48 AM EDT (04:48 UTC)
Expired
Aug 19, 2021, 1:15 AM EDT
In force
27 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Tornado
Radar indicated
Hail
0.75 in

Counties Hunterdon County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 04:48 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 4.8 hours before the alert went out and 191 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Brookhaven, NY at 00:00Z on 2021-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 491 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
491 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
580 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
103 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

662 
WFUS51 KPHI 190448
TORPHI
NJC019-PAC017-190515-
/O.NEW.KPHI.TO.W.0032.210819T0448Z-210819T0515Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Mount Holly NJ
1248 AM EDT Thu Aug 19 2021

The National Weather Service in Mount Holly NJ has issued a

* Tornado Warning for...
  West central Hunterdon County in northwestern New Jersey...
  North central Bucks County in southeastern Pennsylvania...

* Until 115 AM EDT.
    
* At 1247 AM EDT, a severe thunderstorm capable of producing a
  tornado was located over Bedminster, or 17 miles south of Easton,
  moving northeast at 35 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Bedminster, Ferndale, Frenchtown, Milford, Bloomsbury, Erwinna,
  Revere and Ottsville.

This includes Interstate 78 in New Jersey between mile markers 7 and
8, and near mile marker 10.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4061 7492 4040 7520 4042 7527 4061 7517
      4063 7515 4067 7507
TIME...MOT...LOC 0447Z 212DEG 30KT 4044 7520 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Meola
1 follow-up statement
722 
WWUS51 KPHI 190502
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
102 AM EDT Thu Aug 19 2021

NJC019-PAC017-190515-
/O.CON.KPHI.TO.W.0032.000000T0000Z-210819T0515Z/
Hunterdon NJ-Bucks PA-
102 AM EDT Thu Aug 19 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 115 AM EDT FOR WEST
CENTRAL HUNTERDON AND NORTH CENTRAL BUCKS COUNTIES...
    
At 102 AM EDT, a severe thunderstorm capable of producing a tornado
was located over Milford, or 11 miles southeast of Easton, moving
northeast at 35 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Frenchtown, Milford, Bloomsbury and Erwinna. 

This includes Interstate 78 in New Jersey mile marker 8 and near mile
marker 10.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4062 7495 4050 7507 4055 7518 4067 7507
TIME...MOT...LOC 0502Z 212DEG 30KT 4055 7511 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Meola

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 11:19 PM EDTAreal Flood AdvisoryPHIWarren3 hr
Aug 19, 1:32 AM EDTSmall Craft AdvisoryPHI5 hr
Aug 19, 2:05 AM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Morris, Somerset3 hr
Aug 19, 2:13 AM EDTFlash Flood WarningPHIBurlington, Camden, Mercer4 hr
Aug 19, 2:33 AM EDTTornado WarningPHIMorris27 min
Aug 19, 2:40 AM EDTTornado WarningPHIMorris24 min
Aug 19, 3:09 AM EDTTornado WarningPHIMercer, Middlesex, Monmouth36 min
Aug 19, 6:09 AM EDTAreal Flood WarningPHIMercer3 hr
Aug 18, 8:53 PM EDTAreal Flood AdvisoryPHIBerks3 hr
Aug 18, 9:10 PM EDTAreal Flood AdvisoryPHILehigh, Monroe, Northampton3 hr
Aug 18, 9:30 PM EDTFlash Flood WarningPHIBerks2 hr
Aug 18, 9:35 PM EDTAreal Flood AdvisoryPHIBerks, Lehigh3 hr
Aug 18, 9:45 PM EDTAreal Flood AdvisoryPHIBerks3 hr
Aug 18, 9:47 PM EDTSpecial Weather StatementPHIBerks58 min
Aug 18, 10:16 PM EDTFlash Flood WarningPHIBerks, Lehigh3 hr
Aug 18, 10:44 PM EDTFlash Flood WarningPHILehigh, Monroe, Northampton4 hr
Aug 18, 10:50 PM EDTFlash Flood WarningPHIBucks, Chester, Montgomery4 hr
Aug 18, 11:19 PM EDTSpecial Weather StatementPHIBucks, Chester, Montgomery41 min
Aug 18, 11:47 PM EDTFlash Flood WarningPHIChester2 hr
Aug 19, 12:04 AM EDTSpecial Weather StatementPHIBucks, Delaware, Montgomery71 min
Aug 19, 12:26 AM EDTTornado WarningPHIBucks, Montgomery34 min
Aug 19, 12:31 AM EDTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery4 hr
Aug 19, 12:44 AM EDTRiver Flood WarningPHIChester5 hr
Aug 19, 12:47 AM EDTTornado WarningPHIChester, Delaware, Montgomery, Philadelphia28 min
Aug 19, 1:14 AM EDTSpecial Weather StatementPHIBucks, Delaware, Philadelphia91 min
Aug 19, 1:30 AM EDTFlash Flood WarningPHIBucks, Delaware, Montgomery, Philadelphia4 hr
Aug 19, 4:33 AM EDTAreal Flood WarningPHIChester, Delaware4 hr
Aug 19, 8:50 AM EDTAreal Flood WarningPHIMontgomery, Philadelphia3 hr
Aug 19, 10:40 AM EDTAreal Flood WarningPHIDelaware3 hr

Nearby

Tornado Warnings in New Jersey, 2021Tornado Warnings in Pennsylvania, 2021Every tornado warning in 2021Tornadoes in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.